The invention relates to a rotary assembly (1) comprising two spaced-apart support members (5a, 5b). A shaft (7) is connected with respective ends to each support member (5a, 5b) via an engagement part (12), and a rotary element (4) having a through hole extending around the shaft so as to be supported on said shaft between support members (5a, 5b). The shaft comprises a flexible wire-like elongate body (6) that is connected to the support members (5a, 5b) under axial tension. The shaft is connected to the support members (5a,5b) in a nonrotating manner, the through hole being of larger diameter than a shaft diameter so that the rotary element (4) is rotatably supported on said shaft (7).